Tube



FIG. 1 is a front side perspective view from below of a tube showing my new design;

FIG. 2 is a rear view with the front being a mirror image thereof;

FIG. 3 is a right side view with the left side being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view. 

The ornamental design for a tube, as shown and described. 